6:46 PM - Deolis Guerra (OAK) underwent reconstructive surgery on the UCL in his right elbow Wednesday, Matt Kawahara of the San Francisco Chronicle reports.

4:20 PM - Deolis Guerra (OAK) will undergo elbow surgery on April 13, Matt Kawahara of the San Francisco Chronicle reports.

9:33 PM - Deolis Guerra (OAK) (forearm) will undergo surgery that will force him to begin the season on the injured list, Martin Gallegos of MLB.com reports.

12:34 PM - Deolis Guerra (OAK) Mark Kotsay said Thursday that Guerra (forearm) will receive a second opinion, Matt Kawahara of the San Francisco Chronicle reports.

1:46 PM - Deolis Guerra (OAK) is considered day-to-day after he experienced forearm tightness coming out of his Cactus League debut Wednesday, Matt Kawahara of the San Francisco Chronicle reports.

5:25 PM - Deolis Guerra (OAK) and the Athletics agreed to a one-year, $815K deal Tuesday, Ken Rosenthal of The Athletic reports.

2:22 PM - Deolis Guerra (OAK) fired 1.2 scoreless innings in a loss to the Yankees on Friday, allowing a hit and recording a strikeout.

3:33 PM - Deolis Guerra (OAK) has seven scoreless appearances spanning 6.2 innings, a stretch during which he's allowed four hits and generated a 7:1 K:BB and one hold.

2:15 PM - Deolis Guerra (OAK) fired a scoreless eighth inning in a loss to the Rangers on Friday, issuing one walk.

1:01 PM - Deolis Guerra (OAK) fired a perfect seventh inning in a loss to the Rangers on Monday, recording one strikeout.

12:19 PM - Deolis Guerra (OAK) fired 2.1 perfect innings during which he recorded three strikeouts in an extra-inning loss to the Mariners on Monday.

8:33 AM - Deolis Guerra (OAK) (1-1) allowed one run on one hit and a walk over an inning as he took the loss Sunday against the Angels.

11:24 PM - Deolis Guerra (OAK) who most recently fired three scoreless innings in a loss to the Red Sox on Thursday, has worked a total of seven innings in his last three appearances.

3:43 PM - Deolis Guerra (OAK) contract was selected by the Athletics on Thursday.

1:09 PM - Deolis Guerra (OAK) was reassigned to minor-league camp Saturday.

1:43 PM - Deolis Guerra (OAK) joined the Athletics as a non-roster invitee Tuesday, Matt Kawahara of the San Francisco Chronicle reports.